Academic Research Publishing Agency Press
International Journal of Research and Reviews in Applied Sciences
ISSN: 2076-734X, EISSN: 2076-7366

Volume 22, Issue 3(March, 2015)

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1. OPTIMIZATION OF CONCRETE MADE WITH ABAKALIKI QUARRY DUST AS FINE AGGREGATE USING SCHEFFE’S OPTIMIZATION MODEL
by Chijioke Chiemela, Okoye Peter C., Nwosu Pius C., Oke O. Mong & Ndubuisi Christian O.
Abstract

In recent years, Nigeria has witness rapid development especially in the area of infrastructural development like roads, bridges, buildings etc. The conventional methods used in concrete mixing have its own peculiar problems, like time wasting, material wasting and errors. These problems have been the cause of structural failures which has given rise to loss of life and properties. Hence the need to development a method that will take care of all these anomalies witness in the conventional method. This work is aim at removing these anomalies by the use of Scheffes Optimization method. This optimization method can predict the compressive strength of a concrete given the mix ratios and also predict the mix ratios required to give a compressive strength for a particular concrete made by completely replacing river sand with quarry dust. With this method it will be easy to predict the compressive strength of concrete based on the type of structure it is to be used for, there by eliminating the problems associated with structural collapse due to errors in concrete mixing by conventional method.

Source: International Journal of Research and Reviews in Applied Sciences
March 2015-- Vol. 22 Issue 3-- 2015

2. APROXIMATE SOLUTION FOR A COUPLED SYSTEM OF DIFFERENTIAL EQUATIONS ARISING FROM A THERMAL IGNITION PROBLEM

by Sidrah Ahmed, Faqir Shah & Nadeem Salamat

Abstract

This article presents the approximate series solution of a coupled system of a partial differential equations and ordinary differential equations. The couples system arises from fast ignitig catalytic converters in automobile engineering. The homotopy analysis method (HAM) is applied to obtain the series solution. The HAM solution contains an auxiliary parameter which provides a convenient way of controlling the convergence region of series solution. Results are presented for different case studies and is compared for a case where the continuous solution is explicitly known.

Source: International Journal of Research and Reviews in Applied Sciences 
March 2015-- Vol. 22 Issue 3-- 2015

3. DETERMINATION OF EQUIVALENT ELECTRIC CIRCUIT PARAMETERS OF SINGLE-PHASE POWER TRANSFORMERS WITH DIFFERENT NUMBER OF WINDING TURNS
by Antônio Flavio Licarião Nogueira, Leonardo José Amador Salas Maldonado, Douglas Morais de Melo, Kamila Mariana Devegili & Arthur Garcia Bartsch
Abstract

Static finite element solutions are used to determine the electrical equivalent circuit parameters of a single-phase transformer with different number of winding turns in the primary and secondary circuits. The lumped elements of the electric equivalent circuit correspond to the various physical phenomena in the transformer. The study introduces the sequence of operations necessary to evaluate the parameters of the conventional T-shaped transformer equivalent circuit by means of the numerically simulated open-circuit and bucking tests. The academic problem concerns a step-down transformer with turns-ratio 2:1. The discussion clarifies the concepts of self-, mutual- and total inductances of a giving winding, and how to compute them separately. The discussion also places emphasis on the relationship between the voltage drop on a given transformer winding and the source voltage under open-circuit and bucking test operations.

Source: International Journal of Research and Reviews in Applied Sciences
March 2015-- Vol. 22 Issue 3-- 2015













Academic Research Publishing Agency Press